As my friend was preparing to go to a private poly, the police called and said they had the real perp in custody, oops sorry.
IMO, that is absurd.. to be afraid to take a polygraph test when you know you didn't do it.
It takes alot more than a polygraph test to convict somebody of murder.
If I were in his shoes, and I was completely innocent as he claims he is, I wouldn't hesistate one second to take the polygraph test.
Clearing yourself of the polygraph allows the investigators to focus the investigations in another direction instead of wasting time investigating a dead-end and that's the first thing I'd want them to do.